APA (7th ed.) Citation

Educational Testing Service. (2009). The Official guide to the TOEFL test (3rd ed.). McGraw-Hill.

Chicago Style (17th ed.) Citation

Educational Testing Service. The Official Guide to the TOEFL Test. 3rd ed. New York: McGraw-Hill, 2009.

MLA (9th ed.) Citation

Educational Testing Service. The Official Guide to the TOEFL Test. 3rd ed. McGraw-Hill, 2009.